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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6a417824bd0e12ff99f0d17ec8064d3c43612ec7f088d3c866382fb546ca52' 
  AND token = 'RgW3MupLITudlrietWgZ9ShvhjZFg4+IXQgKQdcujdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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