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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44f16662e1b591350408f15186c10b698d6a07ad63a3f40c2f2b8152f9ee438' 
  AND token = 'MAgCfASJpLiCHtd0fWc/JU+ED0l2rzlNnX3UlbqE0y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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