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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2dc331658c6260e5e2e87de3a199d5c5d191dab10f15e5176b5e4bb0fc8bcad' 
  AND token = 'gaDIhyJIRrIEV+xqfhPDIC4M2gRUc+WsbV34T5JjhVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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