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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a62a35be90df63d3110416635ac670b2fc7f8f5457e9fdeece01b92e508c18c' 
  AND token = '2ndvDAGnoIAo0CZ/FWGXUIqDaIx/AcT3H0BTQcpfX/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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