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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e7eba43cf00bbd2b864978aafa403bee92f0c0cdf5b6d0e52c04b03c758c04' 
  AND token = 'C9L3OQj4yKzVWPMmHM8RSuR9O7aqjW710f/fPUgxPQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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