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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6cdb8a6c7a2df3e4bf05a296e4ae28cd3466cab9930302902d81a3a586a537' 
  AND token = '31/+p61pTKDx8b0hPJDTDi2Q8WhD74xWjJAGGfCXukI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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