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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e29b496017d7130b0a5a8352067dd887f171e250d3cb0e5f981c4505aa036e' 
  AND token = 'uA4CUWl0awa59pF31bfYYdozl0KyFgBuf1tXxjkL2x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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