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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c2ae235048395583972e9a814e3f299d34b0d864d62db88d140af4b2e6e24f' 
  AND token = 'tFLX/aep+9YUDpIew3gphJW1S1PkmkmR//QugO+NykQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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