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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc344053492f7ff9eab1d7d791f912f7f7145c58542afb6bf30ab33ee5a6e5fe' 
  AND token = 'c+FI8x0zccWSGaLiAfwR1TRM8QnicOZow8B4R3NThr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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