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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd49a661b4860e8db088e06fe668b18e3dfdee09dfa5fb3fb3664706768fdc58a' 
  AND token = '+rvIj1y87H6E91GWND5yILyHkf0gyMAC6QKrNnXjNsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}