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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25fa2d9b1bf30e02094e9bfdec722437ebc70fecfafc89759bebe92ad2540bb0' 
  AND token = 'kV40IQQB8M/6TLvqpRrQulApTbncckKAOVbhh0u/S7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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