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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aedf7c8bea7ef5663a1254adb418505b5d6ad4c90642cd8960d090521d37424' 
  AND token = 'Ni1B1v73xG874jm4qPM87M89Qyt2VD6w1cTKp4JwODw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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