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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b9037b2a5d43479a541dae28908405b39dceefb5b1ac961d3a08a925f710d65' 
  AND token = 'KOuU/KUUSYC/MUHeSzoMo1nOIWhcy3kav7NmNyZX4FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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