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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc67c8dff48dec2ff0424eae466b406d68a0e08c83f6983850447f2b55964387' 
  AND token = 'g/Eg6nV/Tg86CW+QWOA8Ex4D8tPoN5k1hD4cDVb5PLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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