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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2fecbd643c1f4867394ae4c6a9636ead1ce4c6e1f4e32ab4fd8b993fa4dae44' 
  AND token = 'BdklhU6acg+eBUjwKSy+iapDmqeyMZ142HHFjL0mD88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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