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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e249b5d8d4526c312f857f18e723d84a5d84b686aa1267beb3640f4b1138609f' 
  AND token = 'hQ3Br99sh2XoBylwc4r39aHxoFGUG2+iOJ71fCsJMbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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