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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8381e49167e5a54083e0eb8002d8cbabccbbd13844720a62d09840412f91e26' 
  AND token = 'Sa2gMj0so+qCkLYFV/cPdUL0/tWSOkxrmWcYkqM7uhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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