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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb3f87bc78bd632f9b54c33925a75e491d4abd112dd96d7d71185ba1309073d' 
  AND token = 'G+j7A/F53AsfdHSUSk2mXDdHpzMJF1eefvLF5f3v8+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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