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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0b83b6232978b42065ac7cad8a713c8114f8051391832b403b32d6c8f29616' 
  AND token = 'Puy63/nl8K/S7vimgWkEy44NtVRQdZnYOtG7lyAbTpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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