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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e256259d303aa56ff504f74b6f64160473b3e2eb038de32c95039d9c226920' 
  AND token = 'dl9mWiCI3V/RR4RhMJkDaj7grfop1BicTtOLgJgU0vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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