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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddfe60b80a2d1cac43d34b93565ed5cffd9e3e092d8cc771997d5ba0e6380ca4' 
  AND token = 'ez+3hNiwjbUne+q1s+N2O6ttEGOIXGvboxN24p38SA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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