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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6577eee10ef35108febed71c34a4ec2530930aa6199b0b0996aaa124bb3be163' 
  AND token = '8ENUGCBehaM/tl1kJeKewO2gck3zqelojNRcIkKaIMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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