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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7387493f47fd0a56db16cc8fbf156ed554f28633c1daead6dc8cfe6eee4bbf' 
  AND token = 'yBFJhiMcyEVf6ZMByiSj2Jc3qIoVcoRxs1aaTM4SkDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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