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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ff3d50b9fb57bae54d33cdf64c8de0eff4a4fa3ac64b8ec9044ef8c30f9f02' 
  AND token = 'bCuZDHYV4T4mn9icVASZZUgIxO8nMqVdi2BdkmnKMpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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