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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc71548c0c9a713df15c028c8d766d4737102299e3a1d673e9eadcc1df03f31' 
  AND token = 'Tkm3YCN5/ej+gTnveuIIzbL1wDRFf3t2nURESIJGi0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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