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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e66e41577584572cbe4f15c57cf2b38e83b5a1d03a4c71d2c216f0b717ffce58' 
  AND token = 'NeSC+i9ik8K855icxA42G0fC9aT3DQMgbaBGCuu7Q60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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