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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89e97c9cd5ffbd84751bd9ee9d039d2184fb7bcd0a0f59a1b0f3a6eca8189ed' 
  AND token = 'sC2OVeZvKc9zx7VEV26atZoI8Uwk//gXy2fdoRSBwfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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