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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a556657b85b6b0562b4b5e3238155e4088f87b4a861c6586598961b54b3fba0' 
  AND token = '5NvKGU2WK4OjuDkCeJ0wsXIJ08zLVbgf1Jk2haaJxDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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