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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6192b051146be113f20ce5eb316d792d985e401f13a931a732bb1f5c4c24fcb0' 
  AND token = '7B7Ciu/UDJimc2PvoZ5IyNNd3aek0/N21+KuGcKflBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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