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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd044ffa07ad10ee26853a0190ba77d79bf9d065fe9071f2570dbd9bed8511b' 
  AND token = 'T85fQILV2Xn4L1nZtvdAm4wNh0EOape9wGVcyAEMxGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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