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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84f1ebcdfaec274f683b9fec02b19596c3ec358725575a513656748c747b4cc' 
  AND token = 'yAnmojf1HPXEjc8y1lyRZ/QW6y0BfIbXDDuguuH7Dtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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