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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f42a21bd724cb17b3dc8e8105006a3ee276c086ca49e4c5186041fe0f13fe40' 
  AND token = 'HinFqoj9xcYj1L9kTuPo9AThDSN2xy6D6tupYVGhF3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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