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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6f95e9799f5d945f3a6daa4a7923cd6e07bbeb9493bb3cc8db1f544f0289ca' 
  AND token = 'raB7Q7V8CIjETnLZYPTPGPvU8GNhe1YZoMxf6FfiHBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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