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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc23dbe9b9576f9a91c020d9d8b659e8d113cd6e16eb64dd0930ee3aebf2ea75' 
  AND token = '0Dlxx4QNrCVgkcV2f6ftd68yxn71nheDrqkyj36Cr9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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