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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b55919d06c9d3d7605ac30617c2ef50b87c198f1cd2e370f697717ee08bbd5a' 
  AND token = 'vixpq3LLafCtZHyRojokL1n+6D96zaKH/vjIOnpzBQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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