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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a684eaeae649c05a1851b9dd7c4b8ae3d210d84a6ddb42fff32b61ee15bc35' 
  AND token = 'q+r6s8xEo7mqiZMbCNd05yWh0h9AQ1Lzi11AP/jGxb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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