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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '381d0fa944f1a0e94461ac8f87785e4a29125d0f2030981f8bd40aae3c2c0e4c' 
  AND token = 'ZbQp1Njb2m1vzuZgA4soVsJHW1d2M8IRGBAwBZ/sHNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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