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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a617c78535ec90a03ff82e90022f3fd28799dffe85c65b357b6a4cdc38ac392' 
  AND token = 'WyAOvnUrP1L1e2BdlZ+F7ud9IcZhr7S44vsSYv/Vu90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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